WebBrain is a free, open-source AI browser agent designed to bring powerful artificial intelligence directly into your web browser's sidebar. Released under the MIT license and developed by Emre Sokullu, WebBrain supports Chromium-based browsers (including Chrome and Microsoft Edge) as well as Firefox, making it a highly accessible productivity tool.

WebBrain puts privacy and choice first. It can be run completely locally on your device using llama.cpp, which means your queries cost nothing and your data never leaves your local machine. For users who want cloud-based power, WebBrain supports a "bring your own API key" model, integrating with Claude, OpenAI, OpenRouter, and over 100 other OpenAI-compatible providers.

While docked in your browser sidebar, WebBrain reads active web pages, extracts structured data, and automates tasks on your behalf. Additionally, the tool includes a multilingual user interface and supports token-conscious screenshot capturing to streamline operations without wasting API limits.

Pros of WebBrain

Free and open-source under the MIT license
Supports local execution via llama.cpp to keep data private and queries free
Allows users to bring their own API keys for Claude, OpenAI, OpenRouter, and 100+ compatible providers
Reads pages, extracts data, and automates browser tasks right from the sidebar
Features a multilingual UI and token-conscious screenshot handling
Compatible with both Chromium-based browsers and Firefox

Cons of WebBrain

Requires manual setup of llama.cpp for local runs or supplying your own API keys for cloud usage
Limited to tasks and automation within the browser sidebar interface

Frequently Asked Questions

What is WebBrain?

WebBrain is a free, open-source AI browser agent built for Chromium browsers and Firefox. It sits in your browser sidebar, allowing you to read pages, extract web data, and automate tasks.

Can I run WebBrain completely offline and for free?

Yes, you can run WebBrain locally on your device using llama.cpp. Under this local setup, your data never leaves your device and most queries cost nothing.

Which cloud models does WebBrain support?

If you prefer cloud-based AI, you can bring your own API key to connect WebBrain with OpenAI, Claude, OpenRouter, or more than 100 other OpenAI-compatible providers.